In this study, 90 headache patients were treated with pulsating electromagnetic fields via large coils to the body for 20 minutes per day for a total of 15 days. Results found the treatment to be either excellent or good for those patients suffering from migraine, tension, and/or cervical headaches. Patients experiencing post-traumatic or cluster headaches did not experience such
benefits.

A. Prusinksi, et al., “Pulsating Electromagnetic Field in the Therapy of Headache,” Journal of Bioelectr., 7(1), 1988, p. 127-128.